Head hair dyeing method

ABSTRACT

There is provided a head hair dyeing method using a two-part hair dye composition which contains a first part containing an alkali agent, a second part containing hydrogen peroxide and a non-aerosol type foamer container for discharging a mixture solution of the first part and the second part as foam, the composition containing a surfactant in at least one of the first part and the second part, the method including discharging the mixture solution as foam, applying the foam to the head hair, and then re-foamed on the head hair.

CROSS-REFERENCE TO RELATED APPLICATIONS

The present application is a divisional application of U.S. Ser. No.13/107,183, filed May 13, 2011, which is a continuation application ofU.S. Ser. No. 12/739,835, filed on Apr. 26, 2010, which is the U.S.National Stage of PCT/JP07/01160, filed Oct. 24, 2007. Each of which isincorporated in entirety by reference.

FIELD OF THE INVENTION

The present invention relates to a head hair dyeing method using atwo-part hair dye composition.

BACKGROUND OF THE INVENTION

While liquid or creamy hair dye compositions have been widely used sofar, it is difficult to apply these compositions to the head hairevenly. In particular, in the case of consumers themselves applying ahair dye composition to their own head hair at the roots or on the backof the head, they need to acquire skills of, such as, “blocking” orusing two mirrors facing each other (“two-mirror technique”), and acareful operation is required to apply the composition evenly.

Accordingly, discharging a composition as foam in order to simplify thehair dyeing operation has been proposed, and hair dyes of a two-partaerosol type and those of a one-part non-aerosol type are known, forexample. However, those of a two-part aerosol type have such problemsthat uneven bleaching or uneven dyeing is likely to occur due to aninconsistent mixing ratio of a first part and a second part, apressure-proof metal container or the like is oxidized and corroded byhydrogen peroxide, and the internal pressure of the pressure-tightcontainer is excessively increased by degradation of hydrogen peroxide.Furthermore, since such a one-part non-aerosol type has no or weakbleaching ability, it is difficult to achieve a great change in thecolor tone by one procedure. Therefore, a problem arises, i.e., a hairdyeing operation tends to be cumbersome since a hair dye is required tobe left to develop for a long time and the procedure is required to berepeated after application.

On the other hand, discharging a two-part hair dye composition as foamfrom a non-aerosol type foamer container (e.g., Patent Documents 1 and2) has been proposed. By discharging a mixture solution of a first partand a second part from a foamer container as foam, variation in themixing ratio hardly occurs compared to conventional two-part aerosolhair dyes and a sufficient bleaching or hair dyeing ability may beobtained compared to conventional one-part non-aerosol hair dyes.

Meanwhile, all of these two-part aerosol type hair dyes, one-partnon-aerosol hair dyes and two-part non-aerosol hair dyes, by which thehair dyes are discharged as foam from foamer containers, still suffer acommon problem, i.e., it is difficult to adjust foam quality by whicheasiness of discharging from a container and operatability on the headhair are well-balanced. To solve this problem, for example, PatentDocument 3 proposes a composition that maintains adequate foam qualityand has an excellent foam breaking property at the time of applicationto the hair. However, a careful operation is still required for evenapplication, and an alternative dyeing method has been needed.

-   [Patent Document 1] JP-A-2004-339216-   [Patent Document 2] JP-A-2006-124279-   [Patent Document 3] JP-A-2001-019626

SUMMARY OF THE INVENTION

The present invention provides a head hair dyeing method using atwo-part hair dye composition which contains a first part containing analkali agent, a second part containing hydrogen peroxide and anon-aerosol type foamer container for discharging a mixture solution ofthe first part and the second part as foam, at least one of the firstand second parts containing a surfactant, the method includingdischarging the mixture solution as foam, applying the mixture solutionto the head hair, and then re-foaming the mixture solution on the headhair.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 shows a state of the two-part hair dye composition used in theexamples and the comparative examples before mixing; and

FIG. 2 shows a state of the two-part hair dye composition used in theexamples and the comparative examples after mixing.

-   1 Units of two-part hair dye composition-   2 First container-   3 Second container-   4 Body of Squeeze container-   5 Squeeze foamer-   6 Squeeze container-   A1 First part-   A2 Second part-   A3 Mixture

DETAILED DESCRIPTION OF THE INVENTION

Viscosity of a mixture solution is required to be made low in order toform foam with a non-aerosol type foamer container. However, dependingon the property of formed foam, foam may disappear during application orleaving out, and the mixture solution applied to the head hair easilydrips down due to the low viscosity.

Furthermore, while it is so convenient that any skills such as blockingand two-mirror technique are not required, however, a high defoamingrate inhibits visualization of incomplete or uneven application to thehair in back of the head. Therefore, uneven hair dyeing may occur, thereason of which is different from those in the use of liquid or creamyhair dyes.

The present invention relates to a head hair dyeing method, by which atwo-part hair dye composition, foamed by using a non-aerosol type foamercontainer, does not drip down between the applying to the head hair andthe rinsing off, and incomplete or uneven application is avoided.

The inventors of the present invention found a head hair dyeing methodthat satisfy the above-described requirements, the method includingapplying a two-part hair dye composition discharged as foam on the headhair by using a non-aerosol type foamer container and the two-part hairdye composition and re-foaming the applied foam on the head hairthereafter.

According to the present invention, since the applied foam is re-foamedon the head hair, foam of a two-part hair dye composition can be rapidlyand reliably spread over to the roots of the head hair without blocking,even the hair in back of the head, a part which is difficult to check,while avoiding incomplete or uneven application without using mirrors.In addition, dripping can be prevented irrespective of the foam propertythat may be varied depending on the structure of a foamer container orthe composition of a two-part hair dye composition.

[Head Hair Dyeing Procedures] [Definition]

In the present invention, the head hair refers to the hair grown on thehead, and the concept thereof does not include the hair separate fromthe head such as a wig and a tress. Furthermore, the head hair may bethe hair of a doll or any animal, but human head hair is preferred.

In the head hair dyeing method of the present invention, a two-part hairdye composition including a first part containing an alkali agent and asecond part containing hydrogen peroxide is used, in which a surfactantis contained in at least one of the first part and the second part. Inthe present invention, the two-part hair dye composition is a conceptincluding both a hair dye composition that contains a dyestuff and ableach composition that does not contain a dye. The head hair dyeingmethod is a concept including a head hair bleaching method.

[Mixture of First Part and Second Part]

A two-part hair dye composition is used for hair dyeing treatment bymixing a first part and a second part immediately before use. In thepresent invention, the first part and the second part may be mixed byany of the following procedures:

1) Mixing before filling in the main body of a foamer container;

2) Mixing in the main body of a foamer container;

3) Mixing by joining the first part and the second part together in agas-liquid mixing chamber of a foamer;

4) Once foaming the first part and the second part separately and thenmixing by joining them together before discharging from the foamer;

5) Mixing separately discharged foams of the first part and the secondpart before applying to the head hair; or

6) Mixing separately discharged foams of the first part and the secondpart on the head hair.

Of these, the procedures of 1) mixing before filling in the main body ofthe foamer container and 2) mixing in the main body of the foamercontainer are preferred, from viewpoints that the structure of thefoamer container can be simplified, compositions of the first part andthe second part can be freely designed, and a reliable uniform mixturecan be obtained.

[Non-Aerosol Type Foamer Container]

In the present invention, the foamer container is a non-aerosol typecontainer and is used to mix a first part and a second part or a mixturesolution thereof with air and discharge them as foam without using apropellant. Use of the foamer container can also prevent the dischargedcompositions from spattering. In particular, a non-aerosol typecontainer can be manufactured at low costs than an aerosol typecontainer, the discharging rate can be easily adjusted, the containercan be re-used by performing a certain treatment, and products can behandled more safely during distribution since no high-pressure gaspropellant is required.

Any container may be used as the foamer container so long as it is anon-aerosol type container having a foam discharging means such as aknown pump foamer container or squeeze foamer container having a foamdischarging means.

The pump foamer container or the squeeze foamer container has a foamgenerating portion such as a net, and preferably has a thin net, from aviewpoint that, when a mixture solution of the first part and the secondpart is solidified to dryness causing clogging, the solids can beimmediately dissolved by the flow of foam at the next discharge,resulting in resolution of clogging. In this case, the net preferablyhas a 50 to 280 mesh, more preferably a 90 to 250 mesh, and even morepreferably a 130 to 220 mesh. Creamy foam can be produced by using a netmesh in this range. Furthermore, preferred examples of materials of sucha mesh include nylon, polyethylene, polypropylene, polyester, teflon(registered trade name), carbon fiber, stainless, and so forth. Ofthese, nylon, polyethylene, polypropylene, and polyester are morepreferred, and nylon is even more preferred.

In the foamer container used in the present invention, at least one,preferably two or more of such nets are disposed. More preferably, twonets are disposed from viewpoints of economic efficiency, foamstability, and the like. In this case, a mesh through which the solutionpasses first is preferably as coarse as or coarser than a mesh throughwhich the solution passes next.

In the foamer container, a portion in contact with the contents (e.g.,inner wall of a container, inner wall of a foam discharging means, etc.)is preferably constituted by materials that are not corroded by alkalisor hydrogen peroxide and are able to pass oxygen generated bydegradation of hydrogen peroxide.

As a product form of the two-part hair dye composition used in thepresent invention containing a first part, a second part and a foamercontainer, the first part and the second part may be filled inrespective containers separate from the foamer container, so that boththe parts should be transferred to the foamer container and mixed beforeuse. Alternatively, one part may be filled in the foamer container, andthe other part may be filled in a separate container, so that the otherpart should be transferred into the foamer container before use. In thiscase, the second part is preferably filled in a foamer containercomposed of a container having gas permeability to prevent the increaseof a pressure in the container due to oxygen generated by degradation ofhydrogen peroxide, and more preferably filled in a foamer container madeof a material having oxygen permeability (e.g., polypropylene orpolyethylene). On the other hand, a container that hardly passes oxygenis required to be used for the first part to prevent oxidation of anoxidative dye.

[Specific Procedures]

In the head hair dyeing method of the present invention, it ispreferable to comb the head hair in advance of application of dischargedfoam. Consequently, the hair hardly gets tangled during the re-foamingtreatment, so that the hair dye composition is not likely to splatter.Furthermore, after the head hair is combed, blocking, generallyperformed in application of a hair dye composition, is not required, andit is preferable not to perform blocking. Consequently, the hair dyecomposition is easily applied to the head hair or re-foamed as describedlater.

From viewpoints of even hair dyeing, prevention of dripping, and asufficient hair dyeing effect, it is preferable that hair dressing isnot applied to the head hair to which the hair dye composition is to beapplied immediately before the hair dyeing. Furthermore, from viewpointsthat the mixture solution is not diluted even hair dyeing can beprovided, dripping may be prevented and a sufficient hair dyeing effectmay be obtained, dry head hair is preferred. When the hair is washedimmediately before the hair dyeing treatment, it is preferable to drythe head hair before hair dyeing treatment. Drying the head hair meansthat the liquid, mainly water, attached due to the hair wash is removedat least to the extent that it does not drip in a spontaneous state.Specifically, it is preferable to dry the hair with a towel or a dryer.

The mixture solution of the first part and the second part discharged asfoam is applied to the head hair after placing it on the hands or abrush, or directly. Here, when hands are used, it is preferable to weargloves. According to the dyeing method of the present invention, sinceblocking generally performed in the application of a hair dyecomposition is not required, the foam may be applied in a short time.Therefore, the application of foam may be started at any head hair site,and it is not necessary to apply it starting with the neckline unlikeconventional liquid or creamy two-part hair dye compositions. It issufficient to start the application at a concerned portion, and it ispreferable to apply foam from the hairline of the head hair or a sitewhere the hair is parted.

It is preferable to discharge foam in about the size of a lemon becauseit is the proper size to place on one hand and to easily apply to thehead hair using hands. In this case, foam is discharged with one handand received with the other hand. Then, after foam received on the handis once applied to the head hair, foam is discharged on the hand againto repeat the application to the head hair. This series of operationsmay be performed very conveniently in a short period.

Furthermore, foam may be applied to the whole head hair or only aspecific portion.

Then, the applied foam is re-foamed on the head hair. The foam may bere-foamed by injecting a gas, using an instrument such as a vibrator ora brush, or with fingers. However, since the two-part hair dyecomposition may be thoroughly spread to the roots of the head hair, itis more preferable to use fingers. The rate of foaming using a vibratoror a brush or with fingers is preferably controlled so that the foamshould not spatter.

Here, the timing of re-foaming may be after the foam has disappearedcompletely, during the process of disappearance, or before the appliedfoam changes. Alternatively, the timing may be after the foam has beencompletely applied to the area that needs applying the foam or duringthe process of application. Re-foaming may be performed continuouslyonce or intermittently in several times. Here, when a vibrator, a brush,or fingers used for re-foaming remain in contact with a part of the headhair, or they are brought into contact within 1 second even if they areonce separated, the re-foaming is assumed as continuous. In short, it issufficient to observe the applied site and suitably foam at least beforeliquid drips from the applied foam. Irrespective of the property of thefoam, dripping may be prevented by re-foaming the foam that almostdisappears. Furthermore, by re-foaming, foam may be changed to thequality suitable for hair dyeing regardless of differences in thestructure of the foamer container or the property of the foam dependingon the composition of the two-part hair dye composition. In some cases,dripping may be prevented, and the foam quality suitable for hair dyeingmay be maintained as it is by using a specific structure of the foamercontainer or a specific composition of the two-part hair dyecomposition. Even in such cases, however, it is preferable to performre-foaming at least once as early as possible after the completion ofthe foam application. By performing re-foaming at an early stage, unevencoloring in an area that needs applying may be prevented. This timing ispreferably within 5 minutes after the completion of application of thedischarged foam to the head hair, more preferably within 3 minutes, evenmore preferably within 1 minute.

Hereafter, specific examples of preferred procedures in the processesfrom discharge of foam to application to the head hair and re-foamingwill be shown according to partial hair dyeing and whole head hairdyeing.

[Partial Hair Dyeing]

1) Discharge a suitable amount of foam on one hand, apply the foam to apart of the head hair, and perform one operation of re-foaming over 1second to 10 minutes, preferably 3 seconds to 3 minutes.

2) Discharge a suitable amount of foam on one hand, apply the foam to apart of the head hair, perform one operation of re-foaming over 1 secondto 10 minutes, preferably 3 seconds to 3 minutes, and repeat theoperation 2 to 30 times. Re-foaming is performed over a total of 2seconds to 20 minutes, preferably 5 seconds to 5 minutes.

[Whole Head Hair Dyeing]

3) Discharge a suitable amount of foam on one hand, apply the foam to apart of the head hair, and perform one operation of re-foaming over 3seconds to 10 minutes, preferably 5 seconds to 3 minutes. Repeat thisoperation to apply the foam over the whole head.

4) Discharge a suitable amount of foam on one hand, apply the foam to apart of the head hair, and perform one operation of re-foaming over 3seconds to 10 minutes, preferably 5 seconds to 3 minutes. Repeat thisoperation to apply the foam over the whole head, and then perform oneoperation of re-foaming over 3 seconds to 10 minutes, preferably 5seconds to 3 minutes. Further, discharge a suitable amount of foam onone hand, additionally apply the foam to a part of the head hair, andperform one operation of re-foaming over the whole head over 3 secondsto 10 minutes, preferably 5 seconds to 3 minutes.

5) Discharge a suitable amount of foam on one hand, apply the foam to apart of the head hair, and perform one operation of re-foaming over 3seconds to 10 minutes, preferably 5 seconds to 3 minutes. Repeat thisoperation to apply the foam over the whole head. After completion of theapplication to the whole head, perform one operation of re-foaming over3 seconds to 10 minutes, preferably 5 seconds to 5 minutes.

6) Discharge a suitable amount of foam on one hand, apply the foam to apart of the head hair, and perform one operation of re-foaming over 3seconds to 10 minutes, preferably 5 seconds to 3 minutes. Repeat thisoperation to apply the foam over the whole head. After completion of theapplication to the whole head, perform one operation of re-foaming overthe whole head over 3 seconds to 10 minutes, preferably 5 seconds to 3minutes, and repeat the operation 2 to 30 times. Re-foaming is performedover a total of 6 seconds to 20 minutes, preferably 10 seconds to 5minutes.

7) Discharge a suitable amount of foam on a brush, and apply the foam toa part of the head hair. Repeat this operation to apply the foam overthe whole head, and perform one operation of re-foaming over the wholehead using the same brush over 3 seconds to 10 minutes, preferably 5seconds to 5 minutes.

8) Discharge a suitable amount of foam on a brush, apply the foam to apart of the head hair, and perform one operation of re-foaming using thesame brush or hands over 3 seconds to 10 minutes, preferably 5 secondsto 3 minutes. Repeat this operation to apply the foam over the wholehead. After completion of application to the whole head, perform oneoperation of re-foaming using the same brush or hands over 3 seconds to10 minutes, preferably seconds to 5 minutes.

The area for re-foaming may be the whole head hair or only a specificportion. Since foam may be thoroughly spread by performing re-foamingover the whole head hair, incomplete dyeing may be prevented even ifapplication of foam is missed at a site that may be hardly checked, suchas the hair in back of the head. In partial dyeing, when re-foaming isperformed on only a specific portion, the border of a dyed portion maybe made unclear, and natural finishing is provided. Furthermore, whenre-foaming is performed, it is very easy to visually check portionswhere foam has spread. Therefore, incomplete dyeing of a portion thatneeds dyeing may be avoided.

After completion of the foam application, the hair is washed after thefoam is left for about 3 to 60 minutes, preferably about 5 to 45minutes. In the present invention, the above-mentioned time aftercompletion of the foam application means all the required time fromcompletion of application of all the foam to the whole head or a desiredportion to rinsing out, and is a concept including time required forre-foaming in addition to the time for simply leaving the hair. Then,the hair is suitably washed with a shampoo or treated with aconditioner, then rinsed with water, and dried.

[Two-Part Hair Dye Composition]

The two-part hair dye composition used in the present invention containsan alkali agent in a first part, hydrogen peroxide in a second part, and(A) a surfactant in at least one of the first part and the second part.Further, (B) a higher alcohol or (C) a nonvolatile hydrophilic solventis preferably contained in the mixture solution of the first part andthe second part.

[Alkali Agent]

Examples of the alkali agent contained in the first part includeammonia, alkanolamine such as ethanolamine, sodium hydroxide, andpotassium hydroxide. Furthermore, ammonium salt such as ammoniumhydrogen carbonate and ammonium chloride, carbonate such as potassiumcarbonate and sodium hydrogencarbonate, and the like may be suitablyadded as buffer.

pH of the mixture solution of the first part and the second part in thetwo-part hair dye composition used in the present invention ispreferably 8 to 11, more preferably 9 to 11, and the amount of thealkali agent used is suitably adjusted so that the mixture solutionshould have the above-mentioned pH.

[Hydrogen Peroxide]

The content of hydrogen peroxide in the second part is preferably 1 to9% by mass, more preferably 3 to 6% by mass. The content of hydrogenperoxide in the mixture solution of the first part and the second partis preferably 1 to 6% by mass, more preferably 2 to 5% by mass. Further,the pH of the second part is preferably 2 to 6, more preferably pH 2.5to 4, to prevent degradation of hydrogen peroxide.

[(A): Surfactant]

A surfactant is added to either the first part or the second part, orboth parts, so that foam should be easily formed by mixing the mixturesolution of the two-part hair dye with air by a foam discharging meansof a foamer container, and that the foam should be stable. anionicsurfactant and/or a nonionic surfactant is preferably used so thatfavorable foam that is readily applied to the head hair can be providedeven when a solution temperature is low or close to ordinarytemperature.

Examples of the anionic surfactant include, such as, a sulfuric acidester type, sulfonic acid type, carboxylic acid type and phosphate estertype anionic surfactants. Preferred examples thereof includealkylsulfate and polyoxyalkylene alkylsulfate of the sulfuric acid estertype, with an alkyl group having 10 to 24 carbon atoms, more preferably12 to 18 carbon atoms. Furthermore, this alkyl group is preferablylinear. Furthermore, of the polyoxyalkylene alkylsulfate,polyoxyethylene alkylsulfate is more preferred. Of these, those with anoxyethylene group having an average number of additional moles of 1 to10, more preferably 2 to 5 are preferred.

Examples of the nonionic surfactant include polyoxyalkylene alkyl ether,polyoxyalkylene alkenyl ether, polyoxyalkylene fatty acid ester,alkylglyceryl ether, polyglycerine fatty acid ester, fatty acid alkanolamide, sugar ether type, sugar ester type, and sugar amide type.Preferred examples thereof include alkyl polyglycoside, polyoxyalkylenealkyl ether and alkylglyceryl ethers. Alkyl polyglycoside preferablyinclude an alkyl group having 8 to 18 carbon atoms, more preferably 8 to14, even more preferably 9 to 11, and this alkyl group is preferablylinear. The average degree of polymerization of a glucoside ispreferably 1 to 5, more preferably 1 to 2. Polyoxyalkylene alkyl etheris preferably an ether having an alkyl group having 10 to 22 carbonatoms, more preferably 12 to 18, and this alkyl group is preferablylinear. Furthermore, polyoxyethylene alkyl ethers are more preferred,and of these, the average added number of oxyethylene group is 1 to 40,more preferably 4 to 30. Alkylglyceryl ethers preferably include analkyl group having 8 to 18 carbon atoms, more preferably 8 to 12, andthis alkyl group is preferably branched.

Two or more types of component (A) may be used in combination, and thecontent thereof in the mixture solution of the first part and the secondpart is preferably 1 to 15% by mass, more preferably 2 to 10% by mass,even more preferably 2.5 to 7% by mass, even more preferably 3 to 5% bymass.

Furthermore, to improve the discharged foam quality at a low solutiontemperature and prevent dripping, it is preferable to use an anionicsurfactant and a nonionic surfactant in combination, and the mass ratioof the anionic surfactant to the nonionic surfactant in the mixturesolution (content of anionic surfactant/content of nonionic surfactant)is preferably 0.01 to 1, more preferably 0.1 to 0.5.

When the two-part hair dye composition used in the present invention isused for dyeing of the head hair, an oxidative dye or a direct dye isadded to the first part. To solubilize these dyes, it is preferable tomainly use nonionic surfactant as surfactant added to the first part,taking into account the high ionic strength of ammonia and carbonatescontained in the first part. On the other hand, anionic surfactants arepreferably added to the second part due to the high ionic strength ofthe first part.

[(B): Higher Alcohol]

The higher alcohol as component (B) is used to allow foam to bemaintained longer and to improve the effect of preventing drippingduring the foam being left to develop after application of a two-parthair dye composition to the head hair. Higher alcohols preferablyinclude an alkyl or alkenyl group having 10 to 30 carbon atoms, morepreferably 12 to 24 carbon atoms, even more preferably 14 to 22. Ofthese, those including an alkyl group, more preferably a linear alkylgroup are preferred. Examples of the higher alcohol as component (B)include myristyl alcohol, cetanol, stearyl alcohol, behenyl alcohol,isostearyl alcohol, and oleyl alcohol. Two or more thereof may be usedin combination.

Two or more types of component (B) may be used in combination, and maybe added to either the first part or the second part or both parts. Thecontent of component (B) in the mixture solution of the first part andthe second part is preferably 0.05 to 1% by mass, more preferably 0.1 to0.8% by mass, even more preferably 0.2 to 0.6% by mass, even morepreferably 0.3 to 0.4% by mass from viewpoints that foaming property isnot deteriorated at a low solution temperature, and that the effect ofpreventing dripping during the foam being left to develop is improved.

In the present invention, the mass ratio of component (B) to component(A) in the mixture solution (content of component [B]/content ofcomponent [A]) is preferably 0.02 to 0.4, preferably 0.03 to 0.3, morepreferably 0.05 to 0.2 to improve the foam quality at a low solutiontemperature and prevent dripping.

[(C): Nonvolatile Hydrophilic Solvent]

Furthermore, it is preferable to add (C) a nonvolatile hydrophilicsolvent to the first part or the second part. Consequently, irritationon the scalp may be reduced which occurs because water is evaporatedfrom the two-part hair dye composition while leaving to develop afterapplication of the two-part hair dye composition to the head hair, andtherefore irritating components such as hydrogen peroxide areconcentrated. Preferred examples of the nonvolatile hydrophilic solventinclude substances without a defoaming action such as polyols and loweralkyl ethers (having 1 to 4 carbon atoms) derived therefrom. Polyolshaving 2 to 6 carbon atoms are preferred, and examples thereof includeglycerin, diglycerin, propylene glycol, dipropylene glycol, 1,3-butanediol, ethylene glycol, diethylene glycol, isoprene glycol, and sorbitol.Examples of lower alkyl ether derived from polyol include mono-loweralkyl ethers and poly-lower alkyl ethers derived from theabove-mentioned polyols (e.g., di-lower alkyl ether). Of these,mono-methyl ether and mono-ethyl ether derived from polyols arepreferred, and specific examples thereof include ethylene glycolmono-methyl ether, ethylene glycol mono-ethyl ether, diethylene glycolmono-methyl ether, and diethylene glycol mono-ethyl ether. Two or morethereof may be used in combination.

The content of the nonvolatile hydrophilic solvent in the mixturesolution of the first part and the second part is preferably 0.1 to 4%by mass, more preferably 0.5 to 3% by mass, even more preferably 1 to 2%by mass, from viewpoints that irritation of the scalp is reduced, andthat favorable foam quality is maintained even at a low solutiontemperature.

Not to cause irritation to the scalp even when the content of thenonvolatile hydrophilic solvent is reduced and to maintain a hair dyeingability and a bleaching ability, the mass ratio of component (A) tocomponent (C) (content of component [A]/content of component [C]) ispreferably 1 to 20, more preferably 1 to 10, even more preferably 1.5 to5, even more preferably 2 to 4.

[(D): Polyquaternium-7]

Polyquaternium-7 as component (D) may be further added to the two-parthair dye composition used in the present invention to improve the effectof preventing dripping. As component (D), commercially availableproducts such as, for example, Merquat 550 (Nalco) may be used.

The content of component (D) in the mixture solution of the first partand the second part is preferably 0.01 to 3% by mass, more preferably0.1 to 1% by mass, even more preferably 0.2 to 0.5% by mass to realizefavorable foam that is easily applied to the head hair even when thesolution temperature is low or close to ordinary temperature, and toobtain an effect of preventing the mixture solution from dripping downbetween the time of application to the hair and the time of rinsing out.

[(E): Polyquaternium-22]

Polyquaternium-22 as component (E) may be further added to the two-parthair dye composition used in the present invention to control thedefoaming property after application to the hair, maintain adequateresidual foam, and easily check applied sites. As component (E),commercially available products such as, for example, Merquat 280 andMerquat 295 (both produced by Nalco) may be used.

The content of component (E) in the mixture solution of the first partand the second part is preferably 0.01 to 0.5% by mass, more preferably0.1 to 0.2% by mass to obtain the above-described effects withoutdeteriorating the foaming property at a low solution temperature.

[Dyes]

The two-part hair dye composition of the present invention may be usedfor bleaching of the head hair when a dye is not added to the mixturesolution of the first part and the second part, and also may be used forhair dyeing by adding an oxidative dye or a direct dye. When thecomposition is used for hair dyeing, the first part contains anoxidative dye and/or a direct dye. Examples of the oxidative dye includedye precursors such as p-phenylenediamine, toluene-2,5-diamine,o-chlor-p-phenylenediamine, N-phenyl-p-phenylenediamine,N,N-bis(hydroxyethyl)-p-phenylenediamine, 3-methyl-4-aminophenol,2-hydroxyethyl-p-phenylenediamine, p-aminophenol, p-methylaminophenol,4-amino-m-cresol, o-aminophenol, 1-hydroxyethyl-4,5-diaminopyrazole, andsalts thereof; and couplers such as resorcin, 2-methylresorcin,1-naphthol, 1,5-dihydroxynaphthalene, 5-amino-o-cresol,m-phenylenediamine, m-aminophenol, 2,4-diaminophenoxyethanol,2,6-diaminopyridine, 2-methyl-5-hydroxyethylaminophenol,2-amino-3-hydroxypyridine, and salts thereof.

Examples of the direct dye include basic dyes, nitro dyes, dispersivedyes, and cationic dyes. More specific examples thereof include2-nitro-p-phenylenediamine, 2-amino-6-chloro-4-nitrophenol,3-nitro-p-hydroxyethylaminophenol, 4-nitro-o-phenylenediamine,4-amino-3-nitrophenol, 4-hydroxypropylamino-3-nitrophenol, HC Blue 2, HCOrange 1, HC Red 1, HC Yellow 2, HC Yellow 4, HC Yellow 5, HC Red 3,N,N-bis(2-hydroxyethyl)-2-nitro-p-phenylenediamine, Dispersive Purple 1,Dispersive Blue 1, Dispersive Black 9, Basic Blue 99, Basic Brown 16,Basic Brown 17, Basic Red 76, Basic Yellow 76, Basic Orange 31, BasicRed 51, and so forth.

[Silicones]

It is preferable that silicone is not added to the mixture solution ofthe first part and the second part in the two-part hair dye compositionused in the present invention from a viewpoint that discharged foam maybe maintained for a long time, however, silicone may be added to acertain extent to work the foam into the head hair smoothly and exert ahigh conditioning effect on the head hair. Examples of the siliconesinclude dimethylpolysiloxane, methylphenylpolysiloxane,polyether-modified silicone, amino-modified silicone, andoxazoline-modified silicone elastomer, and emulsion obtained bydispersing these silicones in water using surfactants. Of these,polyether-modified silicone, amino-modified silicone, and emulsionthereof are preferred, from a viewpoint that a stable dispersion inwater is enabled without using a thickening agent.

When silicones are used for the above-described purpose, the content ofthe silicones in the mixture solution of the first part and the secondpart is preferably 0.01 to 0.5% by mass, more preferably 0.02 to 0.4% bymass, even more preferably 0.05 to 0.3% by mass.

[Other Components]

In addition, depending on the purposes, fragrance, ultraviolet absorber,metal sequestering agent such as edetic acid, disinfectant, preservativesuch as methyl paraoxybenzoate, stabilizer such as fenasetin, etidronicacid, and oxyquinoline sulfate, organic solvent such as ethanol, benzylalcohol, and benzyloxyethanol, water-soluble polymer such asPolyquaternium-6, Polyquaternium-39, and hydroxyethylcellulose,moisturizing agent and the like may be added to the first part and thesecond part. Furthermore, using water as the main medium in the mixturesolution of the first part and second part is preferable.

[Viscosity]

The viscosity of the first part (25° C.) is preferably 1 to 50 mPa·s,more preferably 3 to 40 mPa·s, even more preferably 5 to 30 mPa·s. Theviscosity of the second part (25° C.) is preferably 1 to 300 mPa·s, morepreferably 3 to 200 mPa·s, even more preferably 5 to 100 mPa·s. Theviscosity of the mixture solution of the first part and the second part(25° C.) is 1 to 100 mPa·s, preferably 3 to 50 mPa·s, more preferably 5to 30 mPa·s. The value of viscosity is defined as a value obtained afterrotating Rotor No. 1 of Type B Rotational Viscometer (model TV-10)produced by Tokimec Inc. for 1 minute. Measurement is performed at 60rpm for 100 mPa·s or lower, 30 rpm for 100 to 200 mPa·s, and 12 rpm for200 to 500 mPa·s. By adjusting the viscosity of the mixture solutionwithin the above-mentioned range, the mixture solution may be mixeduniformly without foaming and easily applied to the head hair, foam iswell worked into the head hair, and uniform foam that hardly drips afterapplication to the head hair may be obtained.

By adjusting the viscosity within the above-mentioned range, quality offoam that may be easily applied to and worked into the head hair may beprovided, foam may be prevented from dripping down after application tothe head hair, and foam may be easily discharged using a non-aerosoltype foamer. In order to adjust viscosity to fall within theabove-mentioned range, water-soluble solvents such as ethanol may beadded, or contents and types of surfactant, polyols, higher alcohol, andthe like may be suitably adjusted.

[Gas-Liquid Mixing Ratio]

The gas-liquid mixing ratio of air as foam discharged using a foamercontainer to the mixture solution is preferably 10 to 50 mL/g, morepreferably 15 to 40 mL/g, even more preferably 20 to 30 mL/g, fromviewpoints that the compositions may be easily applied to and workedinto the head hair. It is noted that the gas-liquid mixing ratio here isa value measured as follows.

The gas-liquid mixing ratio is determined by measuring the mass and thevolume of foam discharged at 25° C. are measured. 100 g of the mixturesolution is placed in a foamer container, 20 g of foam is dischargedinto a 1000 mL, measuring cylinder, the volume of the foam is measuredat 1 minute after the start of discharge. The gas-liquid mixing ratio(mL/g) is obtained by dividing the volume (mL) of this discharged foamby 20 g, the mass thereof.

EXAMPLES Example 1, Comparative Example 1

A first part and a second part of a two-part hair dyeing compositionhaving the composition shown in Table 1 are prepared. As shown in FIG.1, 40 g of a first part (A1) is filled in a first container (2) and 60 gof a second part (A2) in a second container (3) (which also serves as asqueeze container main body (4); internal volume, 210 mL). Further, asqueeze foamer (5) (SI Squeeze Foamer produced by Daiwa Can Company) isalso prepared.

TABLE 1 Content in first part First part (% by mass) Para-aminophenol0.8 Meta-aminophenol 0.2 Toluene-2,5-diamine 0.5 Resorcin 0.6 Aqueousammonia (25% by mass) 8.5 Ammonium hydrogen carbonate 8.0 Decylglucoside3.2 Laureth-23 2.0 Propylene glycol 4.0 Polyquaternium-22 0.4Methylparaben 0.1 EDTA-4Na 0.5 Fragrance 0.3 Ascorbic acid 0.4 Anhydroussodium sulfite Balance Water Content in second part Second part (% bymass) Sodium laureth sulfate 1.9 Lauramide propyl betaine 0.05 Laurylhydroxysultaine 0.05 Lauric acid 0.04 Cetanol 1.5 Etidronic acid 0.04Phosphoric acid (75% by Amount required mass) to adjust pH to 3.8 Sodiumhydroxide 0.01 solution (48% by mass) Oxyquinoline sulfate 0.04Glycerine 5.0 Aqueous hydrogen 16.3 peroxide (35% by mass) Water Balance

Subjects (Japanese females with a gray hair percentage of 30%: the hairis cut at a length aligned to the jaw line) receive the above-mentionedfilled first part and second part and the squeeze foamer, and performhair dyeing by the following procedure. The applied hair dye is comparedbetween when an operation of re-foaming on the head hair is performed(Example 1) and when this operation is not performed (ComparativeExample 1) in a half-head study. Evaluation results are shown later.

Hair Dyeing Procedure

1. 40 g of a first part is placed in a container main body (4) of asqueeze container containing 60 g of a second part and mixed, so thatthe mixture solution of the first part and the second part should notfoam, then a squeeze foamer (5) is mounted (FIG. 2).

2. Gloves are put on, the squeeze container is squeezed with one hand inan upright position, and the mixture solution as foam is discharged onthe other hand.

3. The mixture solution as foam is applied to the dry head hair.

4. The operations at steps 2 and 3 are repeated, and the total volume(100 g) of the mixture solution is applied to the whole head hair so asto be evenly distributed between the right and left sides.

5. The mixture solution applied on the right half of the head hair isre-foamed by rubbing the roots of the head hair with fingers, so thatthe right half of the head hair should be covered with the foam (Example1). The left half of the head hair is left as it was (ComparativeExample 1).

6. The mixture is left for 30 minutes after completion of the re-foamoperation on the right half of the head hair.

7. The whole head hair is rinsed with warm water, shampooed, treatedwith a conditioner, and dried successively.

Evaluation Results (1) Dripping of Mixture Solution Example 1

No dripping is observed during the 30 minutes from the start of leavingat step 6.

Comparative Example 1

Dripping occurs at the neckline at 10 minutes after the start of leavingat step 6. Thereafter, dripping also occurs around the forehead andears.

(2) Uneven Dyeing Example 1

The hair is evenly dyed both on the surface and at the roots.

Comparative Example 1

Although the hair on the surface is evenly dyed, the hair at the rootson the back of the head is not dyed at some sites. This appears to bebecause application of the mixture solution is incomplete.

Example 2

A first part and a second part of a two-part hair dyeing compositionhaving the composition shown in Table 2 are prepared. These parts arefilled in the same containers as in Example 1. Further, the same squeezefoamer as in Example 1 is prepared.

TABLE 2 Content of first part First part (% by mass) Toluene-2,5-diamine0.14 Para-aminophenol 0.1 Meta-aminophenol 0.05 Para-amino-ortho-cresol0.1 2,4-Diaminophenoxyethanol 0.15 hydrochloride Aqueous ammonia (28% bymass) 6.0 Ammonium hydrogen carbonate 10.5 Decylglucoside 6.5Trideceth-9 0.6 Laureth-23 1.8 Myristyl alcohol 0.2 Propylene glycol 4.0Ethanol 9.0 Polyquaternium-7 0.6 Polyquaternium-22 0.4 EDTA-4Na 0.1Ascorbic acid 0.3 Anhydrous sodium sulfite 0.4 Fragrance 0.5 WaterBalance Content in second part Second part (% by mass) Sodium laurethsulfate 1.9 Lauramide propyl betaine 0.05 Lauryl hydroxysultaine 0.05Lauric acid 0.04 Cetanol 1.5 Etidronic acid 0.04 Phosphoric acid (75% byAmount required mass) to adjust pH to 3.8 Sodium hydroxide 0.01 solution(48% by mass) Oxyquinoline sulfate 0.04 Glycerine 5.0 Aqueous hydrogen16.3 peroxide (35% by mass) Water Balance

Subjects (Japanese females with a gray hair percentage of 30%: the hairis cut at a length aligned to the jaw line) receive the above-mentionedfilled first part and second part, and the squeeze foamer hair dyeing isperformed by the same procedure as in Example 1, and the hair dye isevaluated for dripping and uneven dyeing.

Evaluation Results

(1) Dripping of Mixture Solution No dripping is observed during the 30minutes from the start of leaving at step 6.

(2) Uneven Dyeing

The hair is evenly dyed both on the surface and at the roots.

Examples 3 to 7

A first part and a second part having the composition (% by mass) shownin Table 3 are prepared. As shown in FIG. 1, 40 g of a first part (A1)is filled in a first container (2), and 60 g of a second part (A2) in asecond container (3) (which also serves as a squeeze container main body(4); internal volume, 210 mL). These containers are left in arefrigerator maintained at 5° C. together with a squeeze foamer (5) (SISqueeze Foamer produced by Daiwa Can Company) for 24 hours.

Immediately after these containers are removed from the refrigerator ina room at 20° C., the first part and the second part are mixed, and asqueeze foamer is mounted on the container, which is given to subjects(Japanese 20's-age females with black hair at a medium length). Subjectsare asked to squeeze the container with one hand several times inupright position it and discharge 20 g of the mixture solution into a1000 mL measuring cylinder. The total volume (mL) of liquid and foam at1 minute from the start of the discharge is measured. A gas-liquidmixing ratio (mL/g) is obtained by dividing this volume by 20 g, and thequality of foam discharged at a low temperature is evaluated as follows.The results are shown in the columns below the composition in Table 3.

Quality of Foam Discharged at a Low Temperature (Evaluation byGas-Liquid Mixing Ratio)

A: 20 mL/g or more and less than 30 mL/g;B: 15 mL/g or more and less than 20 mL/g, or 30 mL/g or more and lessthan 40 mL/g;C: 10 mL/g or more and less than 15 mL/g, or 40 mL/g or more and lessthan 50 mL/g;D: less than 10 mL/g, or 50 mL/g or more.

It is noted that these evaluation criteria are established fromviewpoints of the volume placed on the hand and the bath ratio at thetime of application to the hair.

Further, when 75 g of the mixture solution is used, and subjects dyetheir own head hair by the following procedure, the mixture solution isspread all over the head hair, no dripping is observed, and a uniformhair dyeing result is obtained without uneven dyeing.

“Hair dyeing procedure”

1. Gloves are put on, the squeeze container is squeezed with one hand inan upright position, and the mixture solution as foam discharged on theother hand.

2. The mixture solution as foam is applied to the dry head hair.

3. The operations at steps 1 and 2 are repeated, and 75 g of the mixturesolution is applied to the whole head hair.

4. The applied mixture solution is re-foamed by rubbing the whole headhair with fingers for 20 seconds.

5. The mixture is left for 10 minutes.

6. The applied mixture solution is re-foamed by rubbing the whole headhair with fingers for 30 seconds.

7. The mixture is left for 20 minutes after completion of the re-foamoperation at step 6.

8. The whole head hair is rinsed with warm water, shampooed, treatedwith a conditioner, and dried successively.

TABLE 3 Example (% by mass) 3 4 5 6 7 First part Para-aminophenol 0.150.15 0.15 0.15 0.15 Para-amino-ortho-cresol 0.2 0.2 0.2 0.2 0.2Toluene-2,5-diamine 0.1 0.1 0.1 0.1 0.1 Aqueous ammonia (28% by mass)6.0 6.0 6.0 6.0 6.0 Ammonium hydrogen carbonate 10.0 10.0 10.0 10.0 10.0Decylglucoside 8.5 5.1 18.7 8.5 8.5 Propylene glycol 4.0 4.0 4.0 4.0 4.0EDTA-4Na 0.1 0.1 0.1 0.1 0.1 Ascorbic acid 0.4 0.4 0.4 0.4 0.4 Anhydroussodium sulfite 0.5 0.5 0.5 0.5 0.5 Water Balance Balance Balance BalanceBalance Second part Aqueous hydrogen peroxide (35% by mass) 16.3 16.316.3 16.3 16.3 Sodium laureth sulfate 1.0 0.6 2.2 1.0 1.0 Cetanol 0.60.6 0.6 0.2 1.5 Oxyquinoline sulfate 0.03 0.03 0.03 0.03 0.03 Etidronicacid 0.08 0.08 0.08 0.08 0.08 Sodium hydroxide * * * * * Water BalanceBalance Balance Balance Balance Viscosity of mixture solution 3 3 3 2 28(first part:second part = 1:1.5) (5° C., mPa · s) (A) Surfactant inmixture solution (% by mass) 4.0 2.4 8.8 4.0 4.0 (B) Higher alcohol inmixture solution (% by mass) 0.36 0.36 0.36 0.12 0.9 (B)/(A) 0.09 0.150.04 0.03 0.23 Evaluation Quality of foam discharged A A A A B at lowtemperature Gas-liquid mixing ratio 22 20 20 25 18 (mL/g) * Amountrequired to adjust second part to pH 3.5

Examples 8 to 15

First parts and second parts having the compositions (% by mass) shownin Tables 4 to 6 are prepared. As shown in FIG. 1, 40 g of a first part(A1) is filled in a first container (2), and 60 g of a second part (A2)in a second container (3) (which also serves as a squeeze container mainbody (4), internal volume, 210 mL). Further, a squeeze foamer (5) (SISqueeze Foamer produced by Daiwa Can Company) is prepared.

When subjects (Japanese 20's-age females with black hair at a mediumlength) receive the filled first part and second part and the squeezefoamer and perform hair dyeing by the following procedure, the mixturesolution is spread all over the head hair, no dripping is observed, anda uniform hair dyeing result is obtained without uneven dyeing.

Further, “irritation of scalp” during the hair dyeing is evaluated bysubjects according to the following criteria. The results are shown inthe columns below the composition in Table 4.

Irritation of Scalp

A: Feeling no irritationB: Feeling little irritationC: Feeling slight, but not unbearable, irritationD: Feeling distinct irritation

Hair Dyeing Procedure

1. 40 g of a first part is placed in a container main body (4) of asqueeze container containing 60 g of a second part and mixed, so thatthe mixture solution of the first part and the second part should notfoam, then a squeeze foamer (5) is mounted (FIG. 2).

2. Gloves are put on, the squeeze container is squeezed with one hand inan upright position, and the mixture solution as foam is discharged onthe other hand.

3. The mixture solution as foam is applied to the dry head hair.

4. The operations at steps 1 and 2 are repeated, and 80 g of the mixturesolution is applied to the whole head hair.

5. The applied mixture solution is re-foamed by rubbing the whole headhair with fingers for 15 seconds.

6. The mixture is left for 10 minutes as is.

7. The applied mixture solution is re-foamed by rubbing the whole headhair with fingers for 25 seconds.

8. The mixture is left for 20 minutes after completion of the re-foamoperation at step 7.

9. The whole head hair is rinsed with warm water, shampooed, treatedwith a conditioner, and dried successively.

TABLE 4 Example (% by mass) 8 9 10 First part Para-aminophenol 0.15 0.150.15 Para-amino-ortho-cresol 0.2 0.2 0.2 Toluene-2,5-diamine 0.1 0.1 0.1Aqueous ammonia (28% by mass) 6.0 6.0 6.0 Ammonium hydrogen carbonate10.0 10.0 10.0 Decylglucoside 6.0 6.0 9.0 Laureth-23 2.0 2.0 3.0Propylene glycol 5.0 5.0 4.0 Polyquaternium-7 0.5 0.5 0.5 EDTA-4Na 0.10.1 0.1 Ascorbic acid 0.4 0.4 0.4 Anhydrous sodium sulfite 0.5 0.5 0.5Fragrance 0.5 0.5 0.5 Water Balance Balance Balance Second part Aqueoushydrogen peroxide (35% by mass) 16.3 16.3 16.3 Sodium laureth sulfate2.0 3.0 4.0 Lauric acid 0.01 0.01 0.01 Glycerine 0 2.0 0 Etidronic acid0.08 0.08 0.08 Sodium hydroxide * * * Water Balance Balance BalanceMixing ratio of first part and second part = 1:1.5 (mass ratio) (A)Surfactant in mixture solution (% by 4.4 5 7.2 mass) (C) Nonvolatilehydrophilic solvent in 2 3.2 1.6 mixture solution (% by mass) (A)/(C)2.2 1.6 4.5 Evalua- Irritation of scalp B B B tion * Amount required toadjust second part to pH 3.5

TABLE 5 Example (% by mass) 11 12 First part Toluene-2,5-diamine 0.3 0.3Meta-aminophenol 0.25 0.25 2,4-Diaminophenoxyethanol hydrochloride 0.050.05 Aqueous ammonia (28% by mass) 5.0 5.0 Ammonium hydrogen carbonate10.0 10.0 Decylglucoside 6.0 8.0 Laureth-23 2.0 2.5 Propylene glycol 4.03.5 Ethanol 7.0 7.0 Polyquaternium-7 0.6 0.6 Polyquaternium-22 0.4 0.4EDTA-4Na 0.1 0.1 Ascorbic acid 0.4 0.4 Anhydrous sodium sulfite 0.5 0.5Fragrance 0.5 0.5 Water Balance Balance Second part Aqueous hydrogenperoxide (35% by mass) 16.3 16.3 Sodium laureth sulfate 0.8 1.8Lauramide propyl betaine 0.03 0.08 Lauryl hydroxysultaine 0.02 0.08Octoxyglycerine 0.05 0.05 Cetanol 0.5 0.5 Stearyl alcohol 0.2 0.2 Lauricacid 0.02 0.02 Etidronic acid 0.08 0.08 Sodium hydroxide * * WaterBalance Balance Mixing ratio of first part and second part = 1:1.5 (massratio) (A) Surfactant in mixture solution (% by 3.74 5.406 mass) (C)Nonvolatile hydrophilic solvent in 1.6 1.4 mixture solution (% by mass)(A)/(C) 2.3 3.9 Evalua- Irritation of scalp A A tion * Amount requiredto adjust second part to pH 3.5

TABLE 6 Example (% by mass) 13 14 15 First part Toluene-2,5-diamine 1.61.6 1.6 Meta-aminophenol 0.2 0.2 0.2 Resorcin 1.0 1.0 1.02,4-Diaminophenoxyethanol hydrochloride 0.5 0.5 0.5 Aqueous ammonia (28%by mass) 3.0 3.0 3.0 Ammonium hydrogen carbonate 2.5 2.5 2.5Decylglucoside 8.0 8.0 8.0 Trideceth-9 1.0 1.0 1.0 Laureth-23 2.0 2.02.0 Sodium laureth sulfate 1.5 1.5 1.5 Lauramide propyl betaine 0.010.01 0.35 Myristyl alcohol 0.1 0.1 0.1 Propylene glycol 1.0 2.0 10.0Ethanol 10.0 10.0 5.0 Polyquaternium-7 0.6 0.6 0.6 Polyquaternium-22 0.40.4 0.4 EDTA-4Na 0.1 0.1 0.1 Ascorbic acid 0.3 0.3 0.3 Anhydrous sodiumsulfite 0.4 0.4 0.4 Fragrance 0.5 0.5 0.5 Water Balance Balance BalanceSecond part (common) Aqueous hydrogen peroxide (35% by mass) 16.3 16.316.3 Sodium laureth sulfate 2.5 2.5 0.4 Octoxyglycerine 0.1 0.1 0.1Lauryl hydroxysultaine 0.01 0.01 0.1 Cetanol 0.35 0.35 0.35 Stearylalcohol 0.15 0.15 0.15 Oxyquinoline sulfate 0.04 0.04 0.04 Etidronicacid 0.08 0.08 0.08 Sodium hydroxide * * * Water Balance Balance BalanceMixing ratio of first part and second part = 1:1.5 (mass ratio) (A)Surfactant in mixture solution (% by 6.57 5.67 5.5 mass) (C) Nonvolatilehydrophilic solvent in 0.4 0.8 4.0 mixture solution (% by mass) (A)/(C)16.4 8.2 1.4 Evalua- Irritation of scalp B B A tion * Amount required toadjust second part to pH 3.5

1. A two-part hair dye comprising a first part containing an alkaliagent, a second part containing hydrogen peroxide, and a non-aerosoltype foamer container for discharging a mixture solution of the firstpart and the second part as foam, wherein the mixture solution comprisescomponents (A) and (B), component (A) is 1 to 15% by mass of asurfactant, component (B) is 0.05 to 1% by mass of a higher alcohol, andthe mass ratio of component (B) to component (A) (content of component(B)/content of component (A)) is 0.02 to 0.4.
 2. The two-part hair dyeaccording to claim 1, wherein the mass ratio of component (B) tocomponent (A) (content of component (B)/content of component (A)) is0.02 to 0.2.
 3. The two-part hair dye according to claim 1, wherein pHof the mixture solution is 8 to
 11. 4. The two-part hair dye accordingto claim 1, wherein the viscosity of the mixture solution (25° C.) is 1to 100 mPa·s.
 5. The two-part hair dye according to claim 1, wherein thesurfactant comprises at least one selected from the group consisting ofan anionic surfactant and a nonionic surfactant.
 6. The two-part hairdye according to claim 5, wherein the anionic surfactant comprises atleast one selected from the group consisting of a sulfuric acid estertype, sulfonic acid type, carboxylic acid type and phosphate ester typeanionic surfactant.
 7. The two-part hair dye according to claim 6,wherein the sulfuric acid ester type anionic surfactant comprises atleast one selected from the group consisting of an alkylsulfate and apolyoxyalkylene alkylsulfate.
 8. The two-part hair dye according toclaim 5, wherein the nonionic surfactant comprises at least one selectedfrom the group consisting of a polyoxyalkylene alkyl ether,polyoxyalkylene alkenyl ether, polyoxyalkylene fatty acid ester,alkylglyceryl ether, polyglycerine fatty acid ester, fatty acid alkanolamide, sugar ether type, sugar ester type, and sugar amide type.
 9. Thetwo-part hair dye according to claim 1, wherein the surfactant comprisesan anionic surfactant and a nonionic surfactant, wherein the mass ratioof the anionic surfactant to the nonionic surfactant in the mixturesolution (content of anionic surfactant/content of nonionic surfactant)is 0.01 to
 1. 10. The two-part hair dye according to claim 9, whereinthe higher alcohol comprises a linear alkyl group.
 11. The two-part hairdye according to claim 1, wherein the mixture solution comprisescomponent (C) a nonvolatile hydrophilic solvent.
 12. The two-part hairdye according to claim 11, wherein the component (C) comprises at leastone selected from the group consisting of a polyol and a lower alkylether derived from the polyol.
 13. The two-part hair dye according toclaim 11, wherein the content of the component (C) in the mixturesolution is 0.1 to 4% by mass.
 14. The two-part hair dye according toclaim 11, wherein the mass ratio of component (A) to component (C)(content of component (A)/content of component (C)) is 1 to
 20. 15. Thetwo-part hair dye according to claim 1, wherein the mixture solutioncomprises component (D) Polyquaternium-7.
 16. The two-part hair dyeaccording to claim 15, wherein the content of the component (D) in themixture solution is 0.01 to 3% by mass.
 17. The two-part hair dyeaccording to claim 1, wherein the mixture solution comprises component(E) Polyquaternium-22.
 18. The two-part hair dye according to claim 17,wherein the content of the component (E) in the mixture solution is 0.01to 0.5% by mass.
 19. The two-part hair dye according to claim 1, whereinthe higher alcohol comprises an alkyl or alkenyl group having 10 to 30carbon atoms.